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Primes and Squares Fermat, a French mathematician, proved that some prime numbers can be written as 2 square numbers added together E.g. 29 = 5² + 2² = There are 11 other prime numbers less than 100 which can be written like this Find them! (2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67, 71,73,79,83,89,97 are the prime numbers less than 100)